Physical Review Letters
We show that it is possible to perform a continuous measurement that continually projects a nanoresonator into its energy eigenstates by employing a linear coupling with a two-state system. This technique makes it possible to perform a measurement that exposes the quantum nature of the resonator by coupling it to a Cooper-pair box and a superconducting transmission line resonator.
Jacobs, Kurt; Lougovski, Pavel; and Blencowe, Miles, "Continuous Measurement of the Energy Eigenstates of a Nanomechanical Resonator without a Nondemolition Probe" (2007). Open Dartmouth: Faculty Open Access Articles. 2010.